drivers/pcd8544: fix typos
drivers/pcd8544: fix typos

aeneby/RIOT,authmillenon/RIOT,josephnoir/RIOT,kaspar030/RIOT,authmillenon/RIOT,x3ro/RIOT,toonst/RIOT,kaspar030/RIOT,kaspar030/RIOT,OlegHahm/RIOT,kYc0o/RIOT,ant9000/RIOT,x3ro/RIOT,ant9000/RIOT,OlegHahm/RIOT,miri64/RIOT,x3ro/RIOT,smlng/RIOT,miri64/RIOT,jasonatran/RIOT,miri64/RIOT,OTAkeys/RIOT,aeneby/RIOT,mtausig/RIOT,josephnoir/RIOT,OTAkeys/RIOT,toonst/RIOT,RIOT-OS/RIOT,basilfx/RIOT,toonst/RIOT,yogo1212/RIOT,josephnoir/RIOT,authmillenon/RIOT,smlng/RIOT,basilfx/RIOT,aeneby/RIOT,mtausig/RIOT,yogo1212/RIOT,authmillenon/RIOT,x3ro/RIOT,yogo1212/RIOT,authmillenon/RIOT,OlegHahm/RIOT,toonst/RIOT,basilfx/RIOT,yogo1212/RIOT,yogo1212/RIOT,basilfx/RIOT,smlng/RIOT,kYc0o/RIOT,aeneby/RIOT,jasonatran/RIOT,yogo1212/RIOT,toonst/RIOT,josephnoir/RIOT,RIOT-OS/RIOT,ant9000/RIOT,x3ro/RIOT,kYc0o/RIOT,kYc0o/RIOT,OlegHahm/RIOT,kaspar030/RIOT,RIOT-OS/RIOT,kYc0o/RIOT,OTAkeys/RIOT,kaspar030/RIOT,mtausig/RIOT,ant9000/RIOT,basilfx/RIOT,OlegHahm/RIOT,miri64/RIOT,ant9000/RIOT,jasonatran/RIOT,miri64/RIOT,RIOT-OS/RIOT,aeneby/RIOT,smlng/RIOT,jasonatran/RIOT,OTAkeys/RIOT,mtausig/RIOT,josephnoir/RIOT,authmillenon/RIOT,jasonatran/RIOT,smlng/RIOT,RIOT-OS/RIOT,OTAkeys/RIOT,mtausig/RIOT